End-play device.



R. C. NEWHOUSE.

END PLAY DEVICE.

APPLIOATION IILED OCT. 20, 1911.

1,019,074, Patehted Mar.5, 1912.

WITNESEES- INVENTEI' Q I A TT :1 R N EY UNTTED STATES PATENT OFFICE.

RAY C. NEWHOUSE, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERSCOMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

END-PLAY DEVICE. 7'

Specification of Letters Patent.

Application filed October 20, 1911.

Patented Mar. 5, 1912.

Serial No. 655,717.

To all whom it may concern:

Be it known that I, RAY G. NnwHoUsE, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWVisconsin, have invented a'certain new and useful Improvement inEnd-Play Devices, of which the following is a specification.

This invention relates to improvements in the construction of end playdevices for imparting longitudinal or end motion to rotating shafts.

The object of the invention is to provide an'end play device forrotating shafts, which is simple in construction, automatic in itsoperation and will give'a very slow axial reciprocation to the shaft inaddition to its rotary motion.

The device is adapted to be applied to the shafts of any apparatus inwhich end motion of the shaft is required, but is particularly adaptedto be used on the shafts of crushing rolls wherein a very slowreciprocation of one of the rolls is desired.

A. clear conception of an embodiment of the invention can be had byreferring to the drawing accompanying and forming part of thisspecification.

The figure of the drawing represents a central vertical section throughan end play device, showing same applied to a fragment of a shaft andshaft bearing.

The shaft 1, which may be the shaft of a crushing roll, dynamo orsimilar apparatus, is mounted to rotate within the stationary frame 10,being retained in position by a bearing cap 2. The piston rod 7 is fixedto the end of the shaft 1 concentric therewith, and carries a piston 14at its outer free end. The piston 14: is also concentric with the rod 7and shaft 1, being secured to the rod 7 and adapted to rotate with theshaft 1. The piston let need not, however, be rigidly connected to therod 7 and adapted for rotation with the shaft 1.

The cylinder 13 in which the piston 1 1 is adapted to reciprocate, hasits ends inclosed by means of suitable cylinder heads one of whichcarries a stuffing box 15 surrounding the rod 7. The cylinder 13 ismounted upon a base portion which is rigidly connected with the frame10. Ports 17 connect the piston chamber 16 with a small piston valvechamber 19 formed in the base of the cylinder 13. Ports 18 connect thepiston chamber 16 with the large piston valve chamber 28. The pistonvalve chambers 19, 28, are directly connected by a large central portformed in the base of the cylinder 13. The small piston valve 22 closelyfits the walls of the chamber 19 and is adapted to reciprocate withinthis chamber 19. The large piston valve 27 closely fits the walls of thechamber 28 and is adapted to reciprocate within this chamber 28. Thelever 21 has a central pivot 24 by which it is mounted to swing relativeto the stationary base of the cylinder 13. The upperend of the lever 21is forked and extends upwardly between the enlarged end portions of thesmall piston valve 22. The lower end of the lever 21 is also forked andextendsdownwardly between the enlarged end portions of the large pistonvalve 27. The tension spring 25 has its upper end 26 fastened to thelever 21 at a point above the pivot 24, while the lower end of thespring 25 is secured to the stationary base by a pin 23 below the pivot24, thus forming a toggle.

Ports 20 passing through the base of the cylinder 13 form drains for thechamber 19. Ports 30 formed in the inclosing heads of the chamber 28,likewise form drains for the ends of this chamber. The chamber 28 isconnected by means of ports and passages formed in the stationary base,with the pipe 12 leading to the discharge chamber of a pump 9. Themid-portion of the chamber 28 is connected by means of a passage formedin the stationary base with the pipe 31 leading to the fluid supplyreservoir 32. The large piston valve 27 is provided with annularrecesses adjacent the ends thereof and with cut-away portions 29 nearits midportion, the valve being locked against rotation by a smallradial pin which coacts ina groove in the casing.

The pump 9, which may be of any of the well known positive displacementtypes, is mounted on the frame 10, and has a suction pipe 11 leadingfrom the supply tank 32 and a discharge pipe 12 leading to the cylinder13. The pump piston 8 is connected by means of a rod 6 to the eccentric4 which is slidable axially of the piston rod 7 but is positivelyrotated by the rod 7 through a spline 5. The eccentric 4 is preventedfrom moving longitudinally of the frame 10 and cylinder 13 by means of aguide member 3 fixed to the frame.

During the normal operation of the device, the shaft 1 is rotated at ahigh rate of speed, carrying with it the piston rod 7 and piston 14attached thereto. The eccentric 4 carried by the rod 7 is also rotatedthrough the spline 5, causing the pump piston 8 to reciprocate anddrawing the fluid, preferably oil, from the supply reservoir 32 anddischarging same into the pipe 1.2. With the elements in the positionshown in the drawing, the shaft 1, rod 7 and piston 4 are just about tobegin their travel to the left, being in their extreme right position.The fluid from the Chamber 16 at the left of the piston 14 is, with theelements in the position disclosed, forced from said chamber at the leftpassing through the uncovered port 17, chamber 19, uncovered passage 20,and through the port 18 and cut-away portion 29 to the mid-portion ofchamber 28 and pipe 31, from which it passes to the supply reservoir 32.The fluid discharged into the pipe 12 by the pump, flows around theannular recess formed in the valve 27 near the right end thereof,through the port 18 into the chamber 16 at the right of the piston 14.As the displacement volume of the pump 9 is very small compared with thevolume of chamber 16, the fluid entering the chamber 16 at the right ofthe piston 14 gradually forces the piston 14 to the left. As the piston14 approaches the left end of its stroke, the port 17 near the right endof the cylinder is gradually opened, permit-ting fluid under pressure topass through the port 17 to the chamber 19 at the right of the smallpiston valve 22. As the pressure on the right end of the piston valve 22increases, it gradually forces the oil at the left of the valve 22 outthrough the small port 20, moving the valve toward the left and with itthe upper forked end of the lever 21, which lever in the meantime swingsabout the pivot 24. As soon as the axis of the tension spring 25 passesthe axis of the pin 24, the spring tends to pull the end of the lever 21toward the pin 23 by swinging the lever 21 in an anticlockwise directionof rotation about the pin 24. Since the motion of the lever after it haspassed the midposition is very rapid, the forked lower end of the lever21 imparts a blow upon the end face of the ported, large piston valve27, causing this valve to suddenly change its position to the extremeright of the chamber 28. With this new positioning of the valves 22, 27,the annular recess near the left end of the large piston valve 27formsacommunication from the pipe 12 to the left piston chamber, whilethe right piston chamber 16 is opened to exhaust. As the pump 9continues to operate, the piston 14 and shaft 1 are gradually forcedtoward the right, eventually returning the mechanism to the posit-ion asdisclosed in the drawing.

It should be noted, that as the rod 7 reciprocates, the eccentric 4slides along the spline 5, thereby receiving the rotary motion of theshaft 1, but not the axial motion. The rate of reciprocation of theshaft can be readily varied by several methods, as by varying the throwof the eccentric 4, or by changing the relative volumes of the chamberof the pump 9 and chamber 16. As the rate of reciprocation for variousclasses of machinery varies, it might be desirable to provide a meansfor varying the eccentric throw.

It should be understood that it is not de-- sired to be limited to theexact details of construction shown and described, for obshaft isreciprocated longitudinally.

3. In combination, a rotary shaft, a piston connected to said shaft,andautomatic means for admitting fluid under pressure to opposed endsurfaces of said piston to reciprocate said shaft longitudinally.

4. In combination, a rotary shaft, and fluid pressure actuated means forperiodically moving said shaft longitudinally in opposite directions.

5. In combination, a rotary shaft, and automatic means for effectinglongitudinal reciprocation of said shaft by fluid pressure.

6. In combination, a rotary shaft, a piston connected to said shaft,means for admitting fluid under pressure to either side of said pistonand for exhausting said fluid after admission, and automatic means forsuddenly shifting the admission of fluid under pressure from one side'ofsaid piston to the other.

In testimony whereof, the signature of the inventor is affixed hereto inthe presence of two witnesses.

RAY C. NEVVHOUSE.

Witnesses:

CrIAs. L. BYRON, WV. I-I. LmBER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

